add link subcommand

src/command/link.rs

@@ -0,0 +1,15 @@
+use crate::page_id::PageId;
+use crate::page_title::PageTitle;
+use crate::url_helpers::{page_url, title_url};
+
+pub fn link(id_like_or_title: &str) -> Result<(), Box<dyn std::error::Error>> {
+  let url = match PageId::from_like_str(id_like_or_title) {
+    Some(page_id) => page_url(&page_id),
+    None => {
+      let page_title = PageTitle::from_str(id_like_or_title);
+      title_url(&page_title)
+    }
+  };
+  println!("[{}]({})", id_like_or_title, url);
+  Ok(())
+}

src/command/mod.rs

@@ -1,4 +1,5 @@
 pub mod edit;
+pub mod link;
 pub mod list;
 pub mod list_title;
 pub mod new;

src/main.rs

@@ -19,6 +19,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                         .required(true),
                 ),
         )
+        .subcommand(
+            clap::SubCommand::with_name("link")
+                .about("Shows a link for memo")
+                .arg(
+                    clap::Arg::with_name("ID_LIKE_OR_TITLE")
+                        .help("the id or title of the memo")
+                        .required(true),
+                ),
+        )
         .subcommand(
             clap::SubCommand::with_name("list")
                 .about("Lists memos")
@@ -58,6 +67,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             let id_like_string = sub_matches.value_of("IDLike").expect("IDLike required");
             crate::command::edit::edit(id_like_string)?
         }
+        ("link", Some(sub_matches)) => {
+            let id_like_or_title_string = sub_matches
+                .value_of("ID_LIKE_OR_TITLE")
+                .expect("ID or TITLE required");
+            crate::command::link::link(id_like_or_title_string)?
+        }
         ("list", Some(sub_matches)) => {
             let obsoleted = sub_matches.is_present("obsoleted");
             crate::command::list::list(obsoleted)?